（A）铝+氧气→三氧化二铝

（B）氢气+氧气 $\stackrel{点燃}{\to }$ 水

（C）碱式碳酸铜 $\stackrel{加热}{\to }$ 氧化铜+水+二氧化碳

（D）乙炔+氧气 $\stackrel{点燃}{\to }$ 二氧化碳+水．

    One day, Mr. Black went into a restaurant. He put his coat on a chair near the door. There was nothing in the pockets of his coat. After he had his meal, he went to take his coat back. He found there was much money in one of his pockets. “Whose is this?” he thought. He saw a waiter near the door. So Mr. Black said to him, “Somebody put a lot of money in my coat. I have no time to wait for him. I have to go. Take it, please. When he comes back, give it to him.” The waiter took it and went away. At the moment, another man came with a coat just like Mr. Black's. “I'm sorry,” said the man. “I took your coat and you got mine. Please give me my coat and the money. ” Mr. Black answered, “I gave it to the waiter. He'll give it to you. ”

    Mr. Black called the manager（经理）, but the manager said, “We have no waiters here. We only have waitresses（女服务员）. He must be a thief（小偷）.”